Various changes:

* Improve type inference for numeric if statements (if_infer test)

* Correctly handle constraints for existentially quantified constructors (constraint_ctor test)

* Canonicalise all numeric types in function arguments, which
  triggers some weird edge cases between parametric polymorphism and
  subtyping of numeric arguments

* Because of this eq_int, eq_range, and eq_atom etc become identical

* Avoid duplicating destruct_exist in Env

* Handle some odd subtyping cases better

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